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I'm a bit at a loss regarding the translation of dating information from anno to janno for samples with Radiocarbon dates (contextual dates are no problem). We have these three columns Date_BC_AD_Median, Date_BC_AD_Start and Date_BC_AD_Stop and there would be multiple ways to copy them from anno to janno. I see the following options

1. Take the AADR's 95.4% CI calibrated radiocarbon age range in Full Date:... to fill Date_BC_AD_Start and Date_BC_AD_Stop and its Date mean in BP in years before 1950 CE... to fill Date_BC_AD_Median. That's my personal favorite, but @stschiff dismissed it, because we don't know exactly how Prof. Reich arrived at Date mean in BP in years before 1950 CE...
2. Take the AADR's 95.4% CI calibrated radiocarbon age range in Full Date:... to fill Date_BC_AD_Start and Date_BC_AD_Stop and leave Date_BC_AD_Median empty
3. Calibrate the Radiocarbon ages ourselves with poseidonR::quickcalibrate() to fill all three columns. But that only uses a default intcal20 for everything

Did I miss something @dhananjaya93?